A Berkeley, Calif., couple found dead in their home earlier this week may have been killed by carbon monoxide, authorities said, and the cause of their deaths remains under investigation.

A report erroneously blamed the deaths of Roger Morash, 35, his wife Valerie Morash, 32, and their two cats on a 3-D printer – but friends later said the couple's printer wasn't in use at the time they died.

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A friend discovered their bodies Monday in a fourplex on Deakin Street, where they'd been living for several years.

After the couple's sudden death, a GoFundMe page was started to help friends and family with costs for the funeral. It raised more than $15,000 in three days.

The Morash's memorial service was held on Friday, where friends shared memories about the pair.

"They were modest people, they had great educations," Tom Russo, Roger's former co-worker, told KTVU. "But they got up to do their thing every day and they were just the nicest people you'd ever meet."

Roger was a game developer working on and adventure game called "Shard," CBS reported. Valerie was a postdoctoral research fellow at the Smith-Kettlewell Eye Research Institute in San Francisco.

The couple met when they were attending the Massachusetts Institute of Technology.

Editor's note: A previous version of this story said the couple's death was due to their 3-D printer.